TABLE 4.
Virus and VN antibody titers of chickens infected with rD78 or rD78NSΔ IBDV
| Group | Virus titera (PFU/ml) in bursa on day:
|
Mean VN titerb (log2) ± SE on day:
|
|||||
|---|---|---|---|---|---|---|---|
| 2 | 4 | 6 | 9 | 21 | 14 | 21 | |
| Control | 0 | 0 | 0 | 0 | 0 | <2 | <2 |
| rD78 | 7.2 × 106 | 2.3 × 106 | 1.3 × 102 | 0 | 0 | 11.3 ± 1.1 | 12.2 ± 0.4 |
| rD78NSΔ | 3.0 × 105 | 6.8 × 105 | 2.2 × 106 | 1.8 × 102 | 0 | 10.8 ± 0.5 | 12.0 ± 0.1 |
a
Determined by plaque assays on CEF cells.
b
VN assays were performed on CEF cells, and the ability to neutralize 500 PFU of D78 virus is represented as log of the 50% endpoint titer.